TT new to me. Two batteries, dated '08, one is 75 amps, one is 675 amps. Its been awhile to have dealt with this. Should the amps be matched or is it like I have one battery? Both are deep cycle, 24dc...
Well, unless that 675 amp battery weighs about 400 lbs, I doubt it's that high of amps. What you are reading is probably a cold cranking figure, not amps.
Those batteries are near end of life more than likely, if not already shot. Have you attempted to charge them ?
Replace with 2 - 6 volt golf cart batteries, connected in series.
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